Audi A4 2001 - 1.4 Refrigerant Circuit and Components; Refrigerant Circuit and Components

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1.4 Refrigerant Circuit and Components
⇒ “1.4.1 Refrigerant Circuit Precautions“, page 21
⇒ “1.4.2 Component Replacement“, page 22
⇒ “1.4.3 Connections For Quick-Release Coupling On Refriger‐
ant Circuit“, page 24
⇒ “1.4.4 O-Ring Seals“, page 24
⇒ “1.4.5 Quick-Release Connections on Refrigerant Lines“, page
25
⇒ “1.4.6 Refrigerant Circuit Connections with Valve for Switches“,
page 26
⇒ “1.4.7 Refrigerant Circuit Pipes and Hoses“, page 26
⇒ “1.4.8 Refrigerant Circuit Pressures and Temperatures“,
page 27
⇒ “1.4.9 Refrigerant Circuit, Converting R12 to R134a “,
page 27
⇒ “1.4.10 Refrigerant Circuit, Cleaning“, page 27
⇒ “1.4.11 Refrigerant Circuit, Flushing“, page 28
⇒ “1.4.12 Refrigerant Circuit Flushing With Compressed Air and
Nitrogen “, page 29
⇒ “1.4.13 Refrigerant Circuit Flushing With Refrigerant R134a“,
page 32
⇒ “1.4.14 Refrigerant Circuit, Repairing“, page 39
⇒ “1.4.15 Switches and Sensors“, page 39
1.4.1 Refrigerant Circuit Precautions
• Any refrigerant circuit components submitted for quality ob‐
servation must be sealed (use the caps that come with the
replacement part).
• Replace damaged or leaking components of refrigerant circuit.
Refer to ⇒ “5 Removal and Installation“, page 191 .
Note
To date, the following replacement parts (A/C compressor, res‐
ervoir, evaporator and condenser) are filled with nitrogen gas.
This charge is being gradually discontinued. Little or no pressure
equalization is therefore noticeable on unscrewing sealing plugs
from replacement parts.
• Workshop-specific instructions, refer to Audi ServiceNet, HSO
Environment.
• Ensure absolute cleanliness when working.
• Wear safety goggles and gloves when working with refrigerant
and nitrogen.
• Switch on existing ventilation systems.
• Use service station to discharge refrigerant circuit, only then
open screw connections and replace malfunctioning compo‐
nents.
• Use a cap to seal off any opened assemblies and hoses to
prevent moisture and dirt from getting in.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
1. General Information 21